Lecture 3 Neuroimaging Techniques 1 Flashcards

1
Q

What does CT stand for?

A

Computed Tomography

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2
Q

Describe how a CT works.

A

Based on X-Rays. The depth of the rays shows how dense the tissue is. X-Ray beam is put into a circular gantry and then spin the X-Ray around so enough information can be gathered to see internal structures past bone.

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3
Q

Why does bone appear bright and air appear dark on a CT scan?

A

Bone blocks the greatest number of X-Rays giving it a bright appearance. Air blocks no X-Rays so gives a dark appearance.

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4
Q

What does MRI stand for?

A

Magnetic resonance imaging

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5
Q

Describe how an MRI works.

A

Interested in the nucleus of hydrogen atoms. Radio signals absorbed by the hydrogen protons and a magnetic resonance signal is omitted.

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6
Q

What is a T1 weighted scan?

A

Characterised by CSF being dark and showing the contrast between white and grey matter.

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7
Q

What is a T2 weighted scan?

A

Shows liquid structures being very bright.

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8
Q
A
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